[IA64] bte_copy of BTE_MAX_XFER trips BUG_ON.

BTE_MAX_XFER is wrong.  It is one greater than the number of cache
lines the BTE is actually able to transfer.  If you request a transfer
of exactly BTE_MAX_XFER size, you trip a very cryptic BUG_ON() which
should certainly be made more clear.

This patch fixes that constant and also cleans up the BUG_ON()s in
arch/ia64/sn/kernel/bte.c to test one condition per line.

Signed-off-by: Robin Holt <holt@sgi.com>
Signed-off-by: Tony Luck <aegl@agluck-desktop.(none)>

1 files changed, 4 insertions, 3 deletions

diff --git a/arch/ia64/sn/kernel/bte.c b/arch/ia64/sn/kernel/bte.c
index 9456d4034024..c6d6b62db66c 100644
--- a/arch/ia64/sn/kernel/bte.c
+++ b/arch/ia64/sn/kernel/bte.c
@@ -97,9 +97,10 @@ bte_result_t bte_copy(u64 src, u64 dest, u64 len, u64 mode, void *notification)
                 return BTE_SUCCESS;
         }
 
-        BUG_ON((len & L1_CACHE_MASK) ||
-                 (src & L1_CACHE_MASK) || (dest & L1_CACHE_MASK));
-        BUG_ON(!(len < ((BTE_LEN_MASK + 1) << L1_CACHE_SHIFT)));
+        BUG_ON(len & L1_CACHE_MASK);
+        BUG_ON(src & L1_CACHE_MASK);
+        BUG_ON(dest & L1_CACHE_MASK);
+        BUG_ON(len > BTE_MAX_XFER);
 
         /*
          * Start with interface corresponding to cpu number